Lewis & Short

undĭsŏnus, a, um, adj. [unda-sono], wave-sounding, sounding or roaring with the waves (poet.): rupes, Stat. Achill. 1, 198: saxum, Val. Fl. 4, 44: Psamathe, id. 1, 364: dei, i. e. sea-gods, Prop. 3 (4), 21, 18.